SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64a7257a150f765834ba248ea029f8bbabe813c409d277f3e9ac37f5becba1fc' 
  AND token = 'BM/OaazxARFywZvu8Ay9zV3wmm6Q/2bw+JhNq0Sk6o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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