SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed31b9d5ff3d2fb3a7020832a4bc21a859f73554f2a6fd7ae6b3c4f6a2bc0f93' 
  AND token = 'jlxsyDeqQAjcPCdEKFquLHJ1YnNA0Xhtx312WYUk7qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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