SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a22db80db94c873f66c6bcfb52b963182080086b53a32057c54265900404b65a' 
  AND token = 'zWwAxWPawHFRFnMv4eRqqhr+T29MQCbcvJ/mVpyezlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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