SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2544ec31a743fea26fde63c311819f4e71b96fbab317be6169f6f554a6735ab' 
  AND token = 'Hif+TGmP+6DuYSX7JZVPkfNM0KW73aj0KMJOkKPghEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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