SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff356b448ac2810f497a37f1c0d85b165e28884fe8a55f7ebc7346d84a7490e1' 
  AND token = 'JnJ4xiFhB8XYxQLfCBzQTqXk2Hyr0TlZdpY8LzRUTB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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