SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b036c017a6f8c5f1562277e33ff523edeaa1a480593f359d9af78407ea3b7b4' 
  AND token = '9/s9wlsOFBvz7iki1iAmAGuEvOXowG09ZsC2ZBr9+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}