SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bcf22709c9a84a2d51581daebb0a9b6db3fd649a56cf137cbe53c79f4af1983' 
  AND token = 'UFSv80OgVL34qgb8jEgKhAxkN9iE+72hBNEJo8wSA8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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