SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62e391eac66dba050e10363d34ff38583e4a90f78ce9815d347da3c775f7e7fa' 
  AND token = 'DuRtwOZMgz5v9wQ+4JhJDOYj/HWxq82IiNu6MppM4aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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