SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eeac076b242f34dd80c2767e3daa39b3f88cc22b8ae691b0c2a6d84586100f8' 
  AND token = 'MQTu5Gg2BiRAhFJjqPQLNU96YTK215Zr7u00qNTv81I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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