SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c733706d1d8de6a04515c71956c679f3631a6362f5572c8b7d9c34ffccf2824' 
  AND token = 'zuUcjcOnvJUVj5qhm6wzWTIpdrmeroqxRfRpmQ3Yea8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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