SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87391da539045d90a9359dfa6bfd22ec1e6ea530cb07974af66bff6864f674ec' 
  AND token = 'TIQoMmFFuZtnhzxt40WZzC1cO1KAu5+XhuHaVNT0qOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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