SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7af87d54b58eb1dc5b18d5dd0442ebc4fe933154b8e52f5d032f68e6627ecec' 
  AND token = 'ulhZw02DvqSd1SkqQXzKMCkBv8FG9bYNwj/kilX6yO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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