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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2abd11a26679e797c1b5bc2edbd46d19437a703e551e3d0071b1e378f93f1941' 
  AND token = 'IWTOaGzjfGNxHIoaD717AgIYRHq0IqEpjbQm5w8nT9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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