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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '600e3b7e4845d1ed8469845cb919c04aaeb5b9086dc49e4cb64378d6d46f0da3' 
  AND token = 'TN/H7kUs917EpGfHJiaawhKdgZSivKs9GxzBRtHOBlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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