SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dad03863d92fd6514624b19663024b73f687c64f5f59f2e69bf7150e49711dd' 
  AND token = 'aTYVO8BUXwNV0g2BKQyqeOl6VLJSd12wZKMf6RoYRpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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