SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2773f6e470883ed0108b9d488cfd752061ce9ea8edf1397a563ccc60ac243548' 
  AND token = 'lBW/0Lh+BqqJmpCyUVVip+0YZ4Kc7LfyP0KvYNQd8bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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