Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3024609bce10d5a2c946bfd3dd09fd1ad549b901ffe279de7f33fce356c0afc' 
  AND token = 'l9VI2V5+dhiqjvejzmHMpJwsmR3mR3SovLNK2f5bRD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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