SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f38fcc66e73eb936f84fcf1798478c9a272968fb9d1f16c5aad7631641e500fa' 
  AND token = 'a+odBYDnqpolTmnVhLa/xB2jHh5WESCdFF6NcXNFGwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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