SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '597a22d9c193ee936a62c6ee98d903a5fd674c48100a759fa70beecb16f7c44a' 
  AND token = 'oQAUI2Y5t2RmzYXHO53knLtHnFIwnAGmYwsLBqhf+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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