I've enabled Google+api, API key is also generated well with empty REFERER field, but i still get 'keyInvalid' response

[Alexander Polovov]

access string:

https://www.googleapis.com/plus/v1/people/me?key=AIzaSyDEv70Re47K1qeS8A6917q57_VLO5PxvwQ

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "keyInvalid",
    "message": "Bad Request"
   }
  ],
  "code": 400,
  "message": "Bad Request"
 }
}