Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c51a53c1b5a5929f7c48a7c0259a2c7ad783cc2ead838c444ec989def1e8a56' 
  AND token = 'zGmpo5W1lA9hjAaIBDaaSAsPz17juRsAi7h6j4OEmTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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