SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49e28f59724d9eb280bef853390383f1de661891f1f3831426fd77fd7fa67247' 
  AND token = 'mb7v8jMGHBQL0G/pOtDvaPbds0QscRfil+DuOU71VDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00285

JSON explain

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