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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4cd2b9bd9f718aa0a545f1a0997ca961e5f1858b8fd98cec1dd629fa7fdb1e5' 
  AND token = 'Jo5YoZx5gQeNQetQO89zkhTOuyE0GBGzlOSLP6cKhRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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