SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc474d3f82c7266a1288f37af51ec322aaffc396a4c710c8b60e7362bd8ee035' 
  AND token = 'QizUTf+mDOfkplCCw8ilb+D67P1VqWWY/jOMJMFTqnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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