SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87b913bf58532bf2b2cc2b6a64860d86c7b146e5c799aea8a337d5d64bf5fb14' 
  AND token = 'ZszRVg3WVGT8kubecJxbOm8Iv+0zByjLWlX87FhiyBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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