Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4187857a5cd04604527c51844184cc3d68d5fc29f65fe8baf6e092f8814aa99d' 
  AND token = 'cMQyPcMYjNonXoMHpUiVaJHa6+cXet4jo7MLWoUOESs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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