SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f326c24eb3294fff54bc0f98bb1e759bd370b6df17ff6dbb86a30742d01cc386' 
  AND token = 'V/VM0lGdnpn/sRdWSmKTwkPWkk6SXXxHqLLCKuO5NLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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