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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c7b472936a7c1bc7cdc619c81eb9a50185e95a3790c4b05f25a6f3585843107' 
  AND token = 'uu/v8xUOBunAc6a7IwP8m6gvlS71HKMFC6/mCuWGAWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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