Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b843bb9d651dc05c90eb052f3fa549f55cb9b39509982aa4d5d6f5ace44a1bd' 
  AND token = 'pXqq4daJe+qKsPcaTJeA2NcfV1lQ8IbAs5eBAFA6tdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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