diff --git a/homeassistant/components/google_assistant/__init__.py b/homeassistant/components/google_assistant/__init__.py
index 0afd66c10aa..8f4ee3b51c4 100644
--- a/homeassistant/components/google_assistant/__init__.py
+++ b/homeassistant/components/google_assistant/__init__.py
@@ -11,8 +11,6 @@ from homeassistant.helpers import config_validation as cv
 
 from .const import (
     CONF_ALIASES,
-    CONF_ALLOW_UNLOCK,
-    CONF_API_KEY,
     CONF_CLIENT_EMAIL,
     CONF_ENTITY_CONFIG,
     CONF_EXPOSE,
@@ -36,6 +34,9 @@ from .const import EVENT_COMMAND_RECEIVED, EVENT_SYNC_RECEIVED  # noqa: F401, is
 
 _LOGGER = logging.getLogger(__name__)
 
+CONF_ALLOW_UNLOCK = "allow_unlock"
+CONF_API_KEY = "api_key"
+
 ENTITY_SCHEMA = vol.Schema(
     {
         vol.Optional(CONF_NAME): cv.string,
@@ -61,8 +62,6 @@ def _check_report_state(data):
 
 
 GOOGLE_ASSISTANT_SCHEMA = vol.All(
-    cv.deprecated(CONF_ALLOW_UNLOCK, invalidation_version="0.95"),
-    cv.deprecated(CONF_API_KEY, invalidation_version="0.105"),
     vol.Schema(
         {
             vol.Required(CONF_PROJECT_ID): cv.string,
@@ -72,13 +71,14 @@ GOOGLE_ASSISTANT_SCHEMA = vol.All(
             vol.Optional(
                 CONF_EXPOSED_DOMAINS, default=DEFAULT_EXPOSED_DOMAINS
             ): cv.ensure_list,
-            vol.Optional(CONF_API_KEY): cv.string,
             vol.Optional(CONF_ENTITY_CONFIG): {cv.entity_id: ENTITY_SCHEMA},
-            vol.Optional(CONF_ALLOW_UNLOCK): cv.boolean,
             # str on purpose, makes sure it is configured correctly.
             vol.Optional(CONF_SECURE_DEVICES_PIN): str,
             vol.Optional(CONF_REPORT_STATE, default=False): cv.boolean,
             vol.Optional(CONF_SERVICE_ACCOUNT): GOOGLE_SERVICE_ACCOUNT,
+            # deprecated configuration options
+            vol.Remove(CONF_ALLOW_UNLOCK): cv.boolean,
+            vol.Remove(CONF_API_KEY): cv.string,
         },
         extra=vol.PREVENT_EXTRA,
     ),
@@ -113,7 +113,7 @@ async def async_setup(hass: HomeAssistant, yaml_config: Dict[str, Any]):
         await google_config.async_sync_entities(agent_user_id)
 
     # Register service only if key is provided
-    if CONF_API_KEY in config or CONF_SERVICE_ACCOUNT in config:
+    if CONF_SERVICE_ACCOUNT in config:
         hass.services.async_register(
             DOMAIN, SERVICE_REQUEST_SYNC, request_sync_service_handler
         )
diff --git a/homeassistant/components/google_assistant/const.py b/homeassistant/components/google_assistant/const.py
index 47ceabb20e8..d6badf2e7ba 100644
--- a/homeassistant/components/google_assistant/const.py
+++ b/homeassistant/components/google_assistant/const.py
@@ -30,9 +30,7 @@ CONF_EXPOSE_BY_DEFAULT = "expose_by_default"
 CONF_EXPOSED_DOMAINS = "exposed_domains"
 CONF_PROJECT_ID = "project_id"
 CONF_ALIASES = "aliases"
-CONF_API_KEY = "api_key"
 CONF_ROOM_HINT = "room"
-CONF_ALLOW_UNLOCK = "allow_unlock"
 CONF_SECURE_DEVICES_PIN = "secure_devices_pin"
 CONF_REPORT_STATE = "report_state"
 CONF_SERVICE_ACCOUNT = "service_account"
diff --git a/homeassistant/components/google_assistant/http.py b/homeassistant/components/google_assistant/http.py
index 4bf0df8b933..5cf1cb14379 100644
--- a/homeassistant/components/google_assistant/http.py
+++ b/homeassistant/components/google_assistant/http.py
@@ -19,7 +19,6 @@ from homeassistant.helpers.aiohttp_client import async_get_clientsession
 from homeassistant.util import dt as dt_util
 
 from .const import (
-    CONF_API_KEY,
     CONF_CLIENT_EMAIL,
     CONF_ENTITY_CONFIG,
     CONF_EXPOSE,
@@ -135,11 +134,7 @@ class GoogleConfig(AbstractConfig):
         return True
 
     async def _async_request_sync_devices(self, agent_user_id: str):
-        if CONF_API_KEY in self._config:
-            await self.async_call_homegraph_api_key(
-                REQUEST_SYNC_BASE_URL, {"agentUserId": agent_user_id}
-            )
-        elif CONF_SERVICE_ACCOUNT in self._config:
+        if CONF_SERVICE_ACCOUNT in self._config:
             await self.async_call_homegraph_api(
                 REQUEST_SYNC_BASE_URL, {"agentUserId": agent_user_id}
             )
@@ -164,25 +159,6 @@ class GoogleConfig(AbstractConfig):
             self._access_token = token["access_token"]
             self._access_token_renew = now + timedelta(seconds=token["expires_in"])
 
-    async def async_call_homegraph_api_key(self, url, data):
-        """Call a homegraph api with api key authentication."""
-        websession = async_get_clientsession(self.hass)
-        try:
-            res = await websession.post(
-                url, params={"key": self._config.get(CONF_API_KEY)}, json=data
-            )
-            _LOGGER.debug(
-                "Response on %s with data %s was %s", url, data, await res.text()
-            )
-            res.raise_for_status()
-            return res.status
-        except ClientResponseError as error:
-            _LOGGER.error("Request for %s failed: %d", url, error.status)
-            return error.status
-        except (asyncio.TimeoutError, ClientError):
-            _LOGGER.error("Could not contact %s", url)
-            return HTTP_INTERNAL_SERVER_ERROR
-
     async def async_call_homegraph_api(self, url, data):
         """Call a homegraph api with authentication."""
         session = async_get_clientsession(self.hass)