SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '481d3d44b5540ffbac757763a3837f46be6cf8ed79c4217256c03737dc4b97ea' 
  AND token = 'qjjrEsc3+2WrjUwcn7QmxXgzCNpM3XmNqpZwu6yxJlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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