SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '330173e6fb384ea40c1fd97bb06ae6962c5b37e5727fea5b5fe28c09775396ed' 
  AND token = '/+jNUGLQxonRjf8RDoI/haWhnuXz6S7J9AdNCgKExFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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