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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dacc214b48c412380aa0a6c930cc707c8804b2fc96ea41555007766eebe40b9' 
  AND token = 'MDwN07YL+hbQ9P0I7auYVciKZzk9P63COm9TByYx5I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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