SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66146864f90146dabd3cfa31f457bd2ac09cbaf01db852233680f26b50bd4bbe' 
  AND token = '0uzh+0K+xalI3JPgTo61wm/0B/Oko697PiuJg4ggBq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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