SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1461157ea3958b7fd641f9c817fc165b49b6fa2b1a35a3cd68206bd490f9cad8' 
  AND token = 'AWeVPoyJ8YjZFISYHm98jNA3PAJ+EkPGh10ScumOlko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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