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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18c42aef0d65cc46a72ff5e5d8d810182628884c6afb04bbdc76e2ec8b6c7777' 
  AND token = 'bq/Ee3loews2m6lcq6V327fUqhxXTcn/4qerpHzV9Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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