SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9b7715937acc57884cc9faee7251ed3a941fae5b4f480264854298bc5a3b6b7' 
  AND token = 'sOoPZxm/6GNWXu+JFadp/cdZQNntR0KRk3tZhOJsx1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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