SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d3032e3867278fb161df76bffcaa0211908c465d0ccd9055e56f14fef93655' 
  AND token = 'xJ8qN27tAdFu/csZvqBUXQZ8Mf+cCUX2XghUghOcv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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