SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f25e5cd3eb167abadacfd1020904b991d46329e6d9c8f70f0d4600f1626e6cdb' 
  AND token = 'AKaiJfrmwZGbOmh2GNKQWWrJBxVRuXSvEZgEDL1Vn4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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