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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589d0a763ed050f4fb223187c9db27ab59e67ab18102ad099b961771ddbc0e0a' 
  AND token = 'lzetw9Xis2/Dm+Kvw792j5LR25eIrMsaCCU9/QygVKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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