SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fde3f77c484e6d8dcfe0a43a58c0b77035f5cb67399e57b615dddc0f5f739e3a' 
  AND token = 'Z++j4Eilv7aJ9QHO+h17gRIT/xfLGmBkVkT/yzbZ11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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