SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a9c7a5339264dc5ae35180e7ce78455d2e008aab6dc0704b3f89ffdbb1e1043' 
  AND token = 'Rhdi5KBSWrpjq3Lt1d4REsl/PKzShgtzmYw3Wk5mozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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