SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9836ce7f20909ee199a10f97cdcf01e68c9c1b22f53ba1864dc17d48c8ab1969' 
  AND token = 'buCO+Xb6c/hY9+LbsZ1whVgoCs4mbwjOLWvyrScAuJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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