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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed75318f24e3eaa664d6339fc62d0d8c013d31a155fce3ac8549eb12a61ef41d' 
  AND token = '3iw53zClD7WunTjE/xtnt+AAWSSWgHK8z6xRyzBAZhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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