SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '419ff6a921360345f60fcb47164ebf7e8e7408ef493d03dd55e2299bb631d7f4' 
  AND token = '/VprWvyqQ4fzZU3vBgDgE9odOlWAyNwxvcJRGVEi1vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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