SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b3faca69e666545189e3b90d20513f709c9406d8a8212109058c4bd889c8626' 
  AND token = 'AsCMWPTZFPr/fgSvJq+k04i1YaVw9UTxS9joj44bQhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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