Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae5301d2e436ce99248502b14634ff923d1ac88a18b501a167f045e8cbdf5be2' 
  AND token = '0yFCD47TQJGx8BYuaAuiwDCIbf7ensRfklb+pJReeP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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