Use HTTP_OK constant (#33798)

* Use http ok constant

* Remove incorrect use

* Run isort

* Fix pylint by adding missing imports

* Fix pylint by fixing one import

homeassistant/components/london_air/sensor.py

@@ -6,6 +6,7 @@ import requests
 import voluptuous as vol
 
 from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.const import HTTP_OK
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import Throttle
@@ -83,7 +84,7 @@ class APIData:
     def update(self):
         """Get the latest data from TFL."""
         response = requests.get(URL, timeout=10)
-        if response.status_code != 200:
+        if response.status_code != HTTP_OK:
             _LOGGER.warning("Invalid response from API")
         else:
             self.data = parse_api_response(response.json())