Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d0bcd908d7ceec91c1b8a9d84c28dbe46f8b358b2ee8e435a02fcada1025d06' 
  AND token = 'uscz38G/sv3Gcf1Ol7Pk71EbdKNBGQQaSTuFM4ixrZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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