Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c15f6da2408afcabad4f86743a8fb25ec59d3e545cd5bd49e3a0cc7020dee6' 
  AND token = 'ApLD7YPvyK2iPpRegTTYQ3jcxIHqPJR3X8wZkXAUqPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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