SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '735b34916dcf302911539e411cb20d17d04d49f6e8883151f75be81261881072' 
  AND token = '2+o4xkiBOWHriUvxfK7VJUc9qn6LxiQPf/MOX6F9clw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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