Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecfc215d3ce177deb3bfdd26ce7bb10ea7a0b1cf94ce464ae2e43df77f1f9b47' 
  AND token = 'mwnxu57Y01ItziT+w/QYC58n+Rqh6dBmrnVCVaT2NlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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