SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '414d9d6ec46766cbb70ca0a87fea689bc9e1d9f89805a9330942067fd0a4ad9d' 
  AND token = '/uvPEftUygeeM+LlCR8BciLwY/3jqLCzVcOiEbSMhsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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