SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea0107267419b65fc7b1fe0c7c13885aee149a0e738507ffa5a6d7929237af4' 
  AND token = 'WNsoK8AHpN+EDUzAJAYqnp5fZjs/U4+KPaZU3/kULX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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