SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c29fe9573fc3e9324bf03f5328e1d7a8f04e056e4a70fe1b4335fc49384bb670' 
  AND token = 'k1JzCasYRS/hVBa+4TfKOv3XGCqZB7O08Am9PTJ7pYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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