SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e586bc1e70fb154042f2fb4d940eb0f3ffcd08ad767af79542bc7a3aee41180' 
  AND token = 'OBji6E/zFJ9fXNytuMtJYi13nVFy61N6pQ2XLfvwKgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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