SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d9cd3b8d0322976f1fac7e5a1b45e6ff1eb68e4ad8eee4420e3e7772bdacbef' 
  AND token = 'kqLemX6fgSvIAUs3N3ZVJamgwXY6mh5GLqrMl2b+eKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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