SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49c3e211418d667272a463ab140dae6af2b4647c46d07c689366d949dc311f60' 
  AND token = 'IYKFLGzHk/3H8KlDE9ZdBfuhmCnn1wjDse3ckUklv8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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