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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43a52a3efd09c8eddee09522fe69b15b0252995cf948c69e84978ab5a24326a0' 
  AND token = 'Ua7Wo6o+nGo18w4cp0sAVEVhNUi0ytaPClFXiCS1Q+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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