SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '627317e4522773a4639f1fb2f3c4cd9f915b3dbff2dd3e45039b1cf62440163c' 
  AND token = '13HvmbZqzEOS6BlfwDdzh/046HgQ6fP5oObjW+cT8LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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