SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '930c32515f5a6b821a2ec431207b3636749095f8e3caacc8b160e8b4a541ddb9' 
  AND token = '6rWco8qxqXYbj1zpxUe0i2WZOHXv30wvBhWzeW+l1gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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