SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a4346e92c83c5fb1fbaa7c52c3ee631faa45794d43c8ae168abf736c452db66' 
  AND token = 'iI32oIgTiOAoNj8veXwtZ9hjFFJmYxMfK58GGGB+NDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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