SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd41ba240f1a9a457ef6e6b914dd23a97dd4b1376745dedb8ab988cd29abc599' 
  AND token = 'mGylMT1SvhJhKVVrhlGR6T8WLAtqIop3fBCS9/e6mjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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