SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80af93ddff701832f68a31d854d09515b696b356e01719cd39962f039fbc0d76' 
  AND token = 'MXaFQkcLvd8lo6jtiE4/1K1hS2ZOZ+QjVXLihx8P8HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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